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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08843fc57a51ced5c9dad0f92f7e4e021a261fc0aea1cd791530a8bbe8faecdb' 
  AND token = 'ZVQuRgBDivQJoi6UoWKT+bKFJv7yxxcP51QlJOn19HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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