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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fd71a838a548f16b318783d2f053b5cadc1d204e4d8e0591dbeffcd13f41f1c' 
  AND token = 'ssQUl89BSiWEF2DdjRQYiAnIAW8MaiHLAFj4zJ1V6wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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