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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05cf874008f999e34c2fb9b0086e4ad8d2bfa21e9dfb9acb44e2fe79e40fd8db' 
  AND token = 'Us4/swclwKagIb9/XpPuYxTtwrQGPp+DBw+0c4Rt06c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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