SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eacb914474efb021001556d2aaa33b69e3cfad328c5d6b7b689b3b4f44ae1f3b' 
  AND token = 'R/KTtJq9+RkjjHW9mKh6d0/m5FJZDMZdyfy1zZqurq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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