SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f4461d7f7e60e9f3667a48ee078e15139d881ccb22eb62ad4de9234a5fb84e5' 
  AND token = 'ZUod7AHnSPz3zXWVnU1E77GQ7zmF5kLhFgF++oQqTpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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