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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3be0d33fd77f486c02c8acda3dff669a3cc243e2e57bec584f2a6fc95fcc874' 
  AND token = '/ZnMia0Wov/HOxrfusx0PLL8H5IP6U2Xyosup8qwYuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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