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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b34c87fa8fe15b66ec3894563504450c513f6bfd2d137988bf0924d55eeeed53' 
  AND token = 'Yy228K3XOMG7dISX6f4ZMafM0BgGpic49LxP8PjfFz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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