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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a15a9bfe21fc5ad55e5a4a5a2d5a22dff59b5dfa893328f43e426323f5d45f13' 
  AND token = '4grn5LqEUOk+o87oizJwto4S+MQPd9OyBTBt4iUaPes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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