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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd35b4e0a6afe3c955bb38795851937d90da53ade261991bc9112f484c5ac099d' 
  AND token = 'x5P8ybaPctoJCNh8Qt0wTTq4dOz/7oOvo9jwRg8ZggI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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