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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9041c2cabf3cb2cf14b27e1cd5877ab8c2b9095422402091f2f127bc59a7df84' 
  AND token = 'XL5kyBRlwR4NCRgY/UxIpxrqG2C4BszOpUB25iw1cw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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