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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31577eb84b662d64e79c4b6f59b600e459cb982bba059967aab00d9521d12d31' 
  AND token = '0IHf2y8Dos/5Hv18v1iUXCMDKorfHCxrHQplszZvzyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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