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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd05c965504053fdd6a49a292bb2fe1de435adce72359d41559f2d56fc363a323' 
  AND token = 'hJtm+wU7gaWd8Z5HcmChZQaxe5sBx5/ulUZvVdn6cgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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