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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f840bf8bc36ec1af4f7c4fc241b04973f93b33426018c793e23aaafda50df93' 
  AND token = 'Lb8l/d+hUYjHav9M6hM96FhNybsa2h2rm0emVn8BCmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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