SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b4158a5f8212c8ce9df48f4317e7fa6d6756362198fda003cfe6a87462d4efb' 
  AND token = 'hwCaTtyqkgMvHWY90jrRt6OxmiWEzYv42ad+qOgREUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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