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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5b436b0fc7cdc77cad7d2eae4f867c84573a0cc11d13382ab83edb68c96d751' 
  AND token = '5bNC7Wyu1H40w17Ds2JwsvBtKNLZOnQ60UyPiTMTNsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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