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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a8684163fa30e797ab1d4571b9c8bb574c3e2db2fd0682b333f0981793d3289' 
  AND token = 'TrCUmOUhOqsAqk5uO/XIb7d6LJLUku/rHdmkDf94iyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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