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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3df6f0a9d77b27cc89889d9a016a84f0a32e39d13998dbf49013477ed24fcf70' 
  AND token = 'GN9kHZT5kU2iEm5HiKsv20KabyCk0w28iZadoCwuRUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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