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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54ebba7650d9cbc152484dc7ddbb3025a4673766910d1a168b7970c9cb8c7fa2' 
  AND token = 'YJ6LhihbIWEgj74K76jEB3tf3AIiPO63jNS8YeyBxOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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