SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '868ae5ca784954e9d486e7584f789eb781cd26499483df21c11f0f338c5cf2cf' 
  AND token = 'rVxMfgXcCISlYPGvIaLKVScYaF0TmDIAv9Cv0JMwqKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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