SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bc7099b00c87cbb520be355f9c91bb9402089fec942fc2474512529b617778f' 
  AND token = 'q0VdZmBWKmw1Zg7TuQDurOaqnl7YrFme3+GpAAKNBxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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