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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22bc397187067ec1be5e181d620b44aa53b7f29fdc26060fdd0904123039e32d' 
  AND token = 'Ri/DMknSuUpExc1VTh3UZcduHUtU8w/4WFdl2JDpp3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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