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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '465c35770f4f214141df8a49fe3370b525eeb31422f53398f0997e59cffc6b8f' 
  AND token = '66fzu91qwWFdgaaAf8kWjr71aqY1EylenDtoOHSDXG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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