Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f109f07d3c55f4a91b18b075cb31c588b2d630561abc9e4330d4871addfd9a21' 
  AND token = '1/bUSxUaUMuJzSW7sXjePVrQ6bC96AbtrGPcaOrWCtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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