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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f99a15169ba0ffaf68ae8d7dae4ef29d6bca8a3252cc3383e4369c466761e43f' 
  AND token = '1+83knyy3wH8o7aMBXFRDxyp5HvBWrzpS/Qqlurx5n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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