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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cd33a11c25cdbd09410b5de5b6fb3c937544d71ee617dc53bd1738e050cacbd' 
  AND token = 'nMs/JOWTNcF7BWSq6AvRpcy4CIMjhQzq7S5FHpW86Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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