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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ed4dcaf8e4258ca86a195a709920e67f46ddce21fab140629ac64b9c8047bd6' 
  AND token = 'To5XIz5Z/WIqoa16z0BXpSvqWVwqXh7yh7DVNHz2WB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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