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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbdc993dd9b349898c03f76b6a275a0284e00ba7e56918d1f5910f3e1e9bd920' 
  AND token = 'jgp47gKkTXgtL06jvTs8lAfnslRnThd2ebI1iGsMpgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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