SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '384961f7fb823d9da807c3497916a1f64c2cd44b89fe29bc81004a38921f432e' 
  AND token = 'jgb0yjOvoizqbnDeVjqebrp4/sF80CchO/jZzFQmZ2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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