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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de219bda7d022999d939b40cfa947ececac2831f3a5471d1afaf17766227d4ea' 
  AND token = 'ViPF1RnbCEX/jVdNnI4gOsv0IjW4gBaVSmIESaX945w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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