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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3690b1d22eb26331bc16ce914b8aee3f1e81eb66a137d40c49785deefe65a9c1' 
  AND token = '0BR8SrDaG7rTCOsE0tul5BEy1wCMoEUg/Zky6hWKNaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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