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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6de1cfcd293df034b0d5fc072384962340c8a6801cb3f0a2ae6266331864d3bf' 
  AND token = 'DYp8pnlwM7OFGsgJu94tM9y+lgMo8/CylA7puCGtIwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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