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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2bb66c225283b53fc8ceef299490eb68f2dcb85d3c757f2889c29b045ece4d1' 
  AND token = '8c5VZ6bggUwT4i9dZ6aZLgKmlA8D87/as0Roc97C3sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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