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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbb39fae3d820bd2af6dc89b586ad08f72af09c3942ca392e50a37f3b65ee193' 
  AND token = '1w8L7z8cYF3SIyws4fiAzJEthsiqy8N+d0K1A73b7+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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