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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bea83e2d528e3613d5715b40a44294b17aca624565c8411f8602c36e7aeb1b39' 
  AND token = 'irHoIHhGMsfl+NYCqwk75VJIPnX3XtoDNbsrv3w9N5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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