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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dd9cc595daa7942cae7b4049e400be88dda59eda64561a463f530ea77754856' 
  AND token = 'HuDkGEUdDPbBBPMwBTb9xzq5hWfkb6+lB4917Gzc12s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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