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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd949202aecd32441370b7523969f4851e83efc808aa3970b9010ae98aad96611' 
  AND token = 'YT8Vosna8Xn0P1k9gespRIlSODRc7BxiuyNBg6o/Hjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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