SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b76eb3a1d826103dc0cfaf040545c0602f77d86a25cb9e76202d1744e739d5b4' 
  AND token = 'hJn1toqYKY82V3Ou1yju6cVEmyzfsWHwAtjnOnfIhco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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