SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba4c048d56962936b89bb074d6fe1a6ab112d6716bd7d38c760cd3d034419341' 
  AND token = '1svofJ72cRoijZo79h+IDpaMSMkwmfV8D1DzGzNFqqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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