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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc732d43f856aa9aa5cdf7c646ebf6b319c438698c8ed249cb9c70c54de87e21' 
  AND token = 'aTzq2avRB93VkxgMVTa5jSenu3otwYIPsLAGEEMt44o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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