SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f185ba92a1a6b07971f1a408dd6564bb355bb90d23d6877e98c18fd498304614' 
  AND token = 'r2GzQcvmqOsFV42r3omSBYdnYrnNP/KjyxYmiFzatwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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