SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c702211512b9d2f948618c836f385dc831fa16f4f1f8931dfac4c6a67633466e' 
  AND token = 'qYASMx8pfsdB0GWBmUqXNFHAS2nsOALiCVwlIuwJR68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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