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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d07773fc3e7a97d5f89f5ac9b667ad7265a9dabfefd63868253c466c981a17c' 
  AND token = 'p5gbqJPYoIrirKx/d7IjXu4LmcyQXDf8Dkx0j14Zm1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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