SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86b0575c53e11258b8c85867cfa74b495ddc8b45d766127495ffdcd9c466635a' 
  AND token = 'VKB0hfQ4RVpxyFJQ+1GIRNIab1mgwT36+F6etrALHLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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