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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1528bb2db2464b9726210cedfd8fd7c32dce69293aa3b16b4c8d6bf3ba548fc' 
  AND token = 'LBxtZY3uheamdidoIPbXuJZuD4qfDgYi5fLw4QBke4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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