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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0878f426a62252904c0163da4a990067f223b28dc6caa4b5f5b028d2de1c18bf' 
  AND token = 'Bq2ou+mbpZHVqRMkbWrWaaY+9uy9HPkoaBIhcNeUxKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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