SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f7353a63b4df6de42b40af3aee978c88810645d53efcaf8da236b15ee5b329b' 
  AND token = 'wnS9VoEYiz6O4iXJm9ng1jmVkGhSdB9e14X4Zhmop3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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