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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf727c6e10b815d68f259b5e85931e3fee1041832c5fbf6289a7dd3eb559a514' 
  AND token = 'xsD9dpnWTedgGMeNpFh+gZ5W4Akm1HtVbRu6XaQjIKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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