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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b953735662b0702cab0249d9b7cd6e2f76a1a85dbb64909ae5f714b6016d3e9' 
  AND token = '71zv0bGR5TGzJH/QWgpURMR3SEK5ETfbzkbTAJUYrFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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