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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7f750a9f1cb7ae0cb0f7f4864b8157f023223a5cdddf8c7091ed507d050eeb5' 
  AND token = 'S56Ui8jS4nu5ZcjvxXxM0WOyciMjqs5mpq8JEeo3wT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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