SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e2e79cd407fa3b68ef05e4f948ecffeb0d02e8345decc269a201f554bf363d3' 
  AND token = 'ov6S+FVIJRHZin+c8Iq1YROK3XTbARXPGqvQdDUgpH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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