SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e85c695b3e6e781a55dd34888489fae1df3d8570bc193c39949f23f6a163c21' 
  AND token = 'hdHos7UzDJC3W/8Y6KLCuJq2e1xvfgvY/z1Uy7SiNyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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