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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09e4bad2c4ddb971a3d9c4e22fbda8432db59a373020958e5c9985e018423e0f' 
  AND token = 'DEjkQknYaUT+xF4nSzUcg2pjFiDoh91fJGgwVLCO2a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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