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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eb823fa5b2fe34b4724dbc5a96213d3e92a2a3ac2a402d3570ba744dc6462c8' 
  AND token = 'FaGP721ElSxsu3DMwk579wzn1bBNgoE+iw1jW2OUjzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}