SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24cfc63f6a16af9cfbd0a33e757dca756b79d89b11bca232f4755882e97ccf34' 
  AND token = 'cBZ7uZWLgoRt+kOJ2zmcUVOMw2T3sI8zsLDrYoJJq48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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