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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efa4053411fb14b2e92f9d04ba11624e50c2ae6220b08bfbfa1bb49accc4e1db' 
  AND token = 'WQLUHactRjZ2ajmiA6qtkcLGZmAuomXB5g+Y58x0LaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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