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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e07b7db7a67a9d4d4a14c721a98ba0d7597adcb46159897dd6100f18512dace' 
  AND token = 'JoNnnSrbnv1p+H2Tg4/c9rgZZd+kiGhbI2Wvs7ymCKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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