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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '460b1fa9b82065ba1855285a4b20b7b73bd279e12fd202a983b4918135158e73' 
  AND token = 'C0jpgK8sazR18QUXjD0/h88M45KEY1PVbrvjkI8hNlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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