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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b573514006aea5cb4f44b7b207c56b39761bda3132ba9da482e33fbb1a992916' 
  AND token = 'tNnvjS9jUpAL64dGHCadQ16r2C0/u8KcIaOVTgqb768=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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