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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6976eeb39bfb9b9899fd9fc84b151ff6686c1aa5abfc17e713466ec9e5b156aa' 
  AND token = '+jM9cFhfmsx+VTN+iAQ7byOjOiLHU9kwT3+dRmiQZ9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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