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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5c99636316e5fa62f8039dbd81cb8a49e931ffdccd409fba729d56cb26f4f8f' 
  AND token = '2s/TD8n6H0eaSOJ58O3DNvlyjnMVhAuIu8Jfq2D+yiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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