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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c054878de279e68c05bdb4b53df21b175d7bd72b2dfbc7fd4ef5e287d11aeff6' 
  AND token = 'MlahFAu6xu0hkjE29AatV4XQRbvz5+w8WZiXO3gJi8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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