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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c1e0636a07af0af7c22e48bd72d258d3ab5ce791f44ec3e5b32026526f3fad2' 
  AND token = 'hsKGSG3YW8bEj1zJ12dHXjZsMIRGjdBsbssKtdZ6nD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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