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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbc241903f762e763e5eac03b9cf16102d2eb48ef2cfafdb32fe8f8499c28e58' 
  AND token = 'hkZoF4u9vCpqCx11Z8MHb7NOpNNO7nuxT4caB7YBYAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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